SECONDARY, construction. That which comes after the first, which is primary:
as, the primary law of, nations the secondary law of nations.

SECONDARY, English law. An officer who is second or next to the chief
officer; as secondaries to the prothonotaries of the courts of king's bench,
or common pleas; secondary of the remembrancer in the exchequer, &c. Jacob,
L. D. h.t.

Spot scanning technology became feasible by advancing the uniform quality beam extraction technology from the accelerator and beam control technology with high accuracy, which includes three primary benefits: (1) more accurate irradiation which can reduce the side effects to the healthy tissues surrounding the tumor compared with conventional double scattering irradiation; (2) patient-specific collimators and boluses are not necessary; and (3) proton beam usage factor is high, reducing unnecessary secondary radiation.

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